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WorksheetsPSYC1040 Central Tendency
Total questions: 11
Worksheet time: 5mins
The skewness of a distribution refers to its:
flatness
peakedness
symmetry
central tendency
variability
What does a positively skewed distribution typically have?
A long tail above the median, along with most of its scores
A long tail below the mean, along with most of its scores
Most of its scores between the 50th and 90th percentile
Most of its scores below the median
A long tail above the mean and most of its scores below the mean
A distribution of scores has a mean of 12, a mode of 18, and a median of 16. The distribution is:
normal
positively skewed
negatively skewed
rectangular
U-shaped
One of the reasons the mean is the preferred measure of central tendency is because:
it's the easiest to calculate
sometimes there isn't a median
it is the basis of many subsequent calculations, like variance and SD
it is always a good measure of central tendency
all of the above
The variance is:
the average distance of scores from the mean
the standard distance of scores from the mean
the largest deviation of the scores from the mean
the average squared distance of scores from the mean
the smallest deviation of the scores from the mean
Which of the following does not apply to the standard deviation?
It is a measure of variability
It is an intuitive description of a dataset's variability
It is a measure of the amount by which scores deviate from the median
It is the square root of the variance
It is a measure of the amount by which scores deviate from the mean
Calculate the average distance of the following scores from their mean:
2 3 4 1 2 3 4 1 5 5 6 2 3 2 4 5 6 2 2 1 3 3 4 5 6 7 7 8 5 4 3 3 2 3 4
0
.5
1
1.5
2
What is the median of the following data set?
21 23 23 23 24 25 26 27 29 30 38 44 52
31
26
23
25
25.5
What is the most appropriate measure of central tendency for the following data set, and why?
21 23 23 23 24 25 26 27 29 30 38 44 82 110
The mode, because it is easy to calculate
The mean, because it is the best measure of central tendency
The mean, because it is an unbiased statistic
The median, because the data set is negatively skewed
The median, because the data set is positively skewed
The tutors decide to all grade the same assignment, chosen at random. If they all give it a similar grade, we can say that the marking criteria has good:
test-retest reliability
inter-rater reliability
predictive validity
face validity
causal interpretability
Brain training games claim to improve your (working) memory, but experiments have not found support for this outside of the games.
What flavour of validity are these games lacking?
face validity
internal validity
construct validity
external validity
none of the above
